When you are lying on your back, put a pillow under neath your knees, this will tilt your pelvis slightly, enough to take some pressure of of
your back. Also, when you lay on your side, put a pillow in
between your knees, this will help as well. I have invested in a $2000 bed just so I can have the proper support. Not saying that you need to spend that much money, thats not the only reason why i bought the bed, but find a bed that is mostly firm but still comfortable.